Well, let’s see: Dudes who couldn’t find a clitoris with GPS and GoogleMaps? Women who are taught to be self-conscious about their bodies and especially their lady-bits? Dudes who assume that if they put it in they’ve done their part? Women who don’t feel the same sort of entitlement towards sexual enjoyment as men? Men who see sex as something that they “get” rather than as a dynamic and highly variable set of acts between two people? Women who are raised believing that being too sexual is slutty, but that sex is something that they have to do for men, and that sex is centered on male pleasure? The construction of sex as between men and women, and something men do to women, and purely penetrative, and beginning when the dude enters and ending when he ejaculates? The many wonderful but sometimes frustrating complications of the human brain and body?